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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ca56efff42a6401908e9b9ee0bb67b242582115e4d0cafe679c5df80b89bdd' 
  AND token = 'OcdEQO6xRZN7bg+0cC6Twv/FaC1klpoEw6fyQ+zSYlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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