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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fce28a51066c64d0c49c15878511307fd9802a3af7b5b10c1f7e016a5b923d' 
  AND token = '9GXjOkzu37v4cuZapAotTYrMkosgO+EDsxQRs/xtfFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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