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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48442ed7583ed98b987ec1c7763a8e9243f7d2ce2e807f55a8966df94f0e32f' 
  AND token = 'cHpLv6BEk2XGBd8o9yEuYEewU6pRaK0QRXklaD5xgM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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