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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fa65653e3149ee95b6fb6b6d2e00b271d3bbece7915f8d4eaec590aab9dc8d' 
  AND token = 'Y8+1yw7GwPV7Eb9N3o5MsCHU3lMjca8K9kJ2eEaMrF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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