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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77099387d652e30a34bbbfb4b4fdd1cf8339d9006644e003e0655c5298d4c61' 
  AND token = '6HdCQOVrkx7wOsVluX3M5Uj9o5VsFyHdmmlblIXGUlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}