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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314e5f1c2b921b4063d515cc15c7267e7d627ac259e032320e5c2b13f9b16ffd' 
  AND token = 'IUt9fv52ZYiGjXO5FF5Sp7cTzTcimcKHve26XQ2dUmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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