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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad9c540760eb57f650c04a4cdec46acfdf9d4920c3e30309bc99bec1ec554c5' 
  AND token = 'uLQ3JUow1VIpfCtLI5E6wSsYDuvz6y9sULg1mkIEh08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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