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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba0767be14c1577eb4ba022dad0950bd0d79407006f52c0890074454a8f1b82' 
  AND token = 'H0yiuRqF4FUFgZHkow3/YCrnjzt+cWCkvszbfoC3bVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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