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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf83f6b739341a8895d8fc3761d35e1fbef144ecdf479ccd8096abe452df1c33' 
  AND token = 'pYtmKS9NIpQXrATO6Pf2lptM9HABqYVcFfurUNmmOTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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