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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03ec58d7073d38566a437cdbdfdc246af1590b3d268e3e3f223f8d57a814dea' 
  AND token = 'mpzysBHsIotTlU84PfHQKbkfM7F4FtIuPjmyNU2LBhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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