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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a818c70d1d79050a5d60366b6cfacf6dd6b7b34a735d78e72571473dc294d2' 
  AND token = 'xENU0NJRIAS/yQPYo+XBesG3KRK4q0bYMyxWR6YGZ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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