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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0aa57281bfd22840f4e26f643bc1dbe9ab0fe9c9b4d782a30500539e4692ba' 
  AND token = '4xVkUGSeBon2iMSoPHrW9ynJvd66OYl2yDTNOMF0dbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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