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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92213fc4931762bc58f250764807a9c482bd6457138828b2ceb19cab357d179a' 
  AND token = 'gmK6P8FaAToimOsnOoQKL2/4bW6RSS17leBoy31+WAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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