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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a717ed95a2add53d86ca2638a44d5980a99826f6e736b8a880f7461074c63a9a' 
  AND token = 'rrRh3TFzdlFQx6SMEaMuR2cghLsloMMRj9c78RPIJ0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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