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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ba3571b1758dd096f65fda18a085be87023890874efff0b4d54fde07b51ce8' 
  AND token = 'kDaW6jC7ACSh05xWFu0pggnH/BqBt6SvCGvdDr2Py4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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