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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577e1be9ae47edc8417ce6769babe8add660d53dbc60bd0e037bfece5bb2a5a4' 
  AND token = 'y823no+KIf9pKRRBQ9Ts9OVyNSGAuBwG0aDh+cK0nZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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