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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e162e7b891bebc864f18f2a67c422e199c0de79f1f1932e5e023c87e5a4de4f' 
  AND token = 'nNyyRFi4xT95YIo3iAzZebW7pkweOQUzoPaFHVzzXBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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