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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67d0ee233dd5e3a62b39da1c1d12897f94026e2c63564f6670c6b8f93d782c4' 
  AND token = 'oFFe0okPoYIHT2galvilYPhW3KMBtQFHM245/xjQBVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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