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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db0c4cd2a2b16a962bc9106732c2da37c9e6fc9437c4af53bf8b749701167b4' 
  AND token = '7qmJAsCRSyQS1rcal+uDpBlWzCkoCrZeIho6iw0tags=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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