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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84ce894475d9795a120505fb1645be7beb65eb9b06261d82284b29c33822e9c' 
  AND token = 'RkQ7w+gIS6fqgOxvzxMBadBDXG04D+/xNZIV+re6+MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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