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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b479701b0900c27afd309584369f3c19d238d54647cc5c7fdf4127f7bf9f1ae' 
  AND token = 'lxn7JssnzY/BpVRzXtV6LD009n3ogrElyVgtcL+42tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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