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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ccd4ed75d144ff9d1d91b5bcc9ddb1d689f20f7cfb151fd164dc14e2b0ad60' 
  AND token = 'TjPxecCiaOozKJHGrbJlFGfq3y1d/O0DwNYOiG49PHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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