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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71785a0fd20f7be674e80be8999ecc5e9834ab6c70c06414402b0e0714eb4914' 
  AND token = 'Oyd9BKWDQGb7WFjvT1mH8LfGwMN9Xrc0DO/PmtU9LTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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