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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bb2dcd054c41bd4d5b3c846097021d887ee507381ab53c69964ce0e171cfee' 
  AND token = 'nIet7Y+ER7unl5W3RW5ysE8OE9lNkpdUWllXCGbpCC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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