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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df92e1db18dc037999fbadcb7e213bcf6909f3340b77ed41fcd15f3bb70e4e4' 
  AND token = 'DOkdNm4EYk7nrsvbkybL+5Sqb0Y+bKbB4pXdUash1ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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