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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c789ebdea8b174420c604b01a9f1ca16a155e80078674d00f1f19eff532a94f9' 
  AND token = 'K5EuNxJEaOeca01qJz7VSOapdwBwR1W3xZqL+T97HO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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