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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6691b9a3efa980f41e55bce1d95161e097049de80cd9f9cc696bc0f71bb9c69' 
  AND token = 'Y6et6ym6oel58ACk2SLJKMG1quXPDvR9OZxdAet45kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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