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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3c50260d21a1b8f7b533e886a95554f5fe96c11a3ad724c4ce27751b43809e' 
  AND token = 'CpCrqyiLErb1MhMf2EfSQVrCTNoA4qTtt/oZJYiWxvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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