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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99653ebcf52d7585b2f420fa55fe5fbad5e698ea47e658a06122381fe017073c' 
  AND token = 'v9506pqui1o/eqntYNy9sb7CnXwZ5ExuKYq6r9I5lH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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