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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbea871865d4dc98e582f1f2ba8d4aca8c422d7b94f792a8a571fece08fe693' 
  AND token = '1nwzqBzj4C4NtvBcr1jpnjFetvKqtpPxY5hFeftBEGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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