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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0b14ec9c3b25aa398b1bd5b1972b5c8bf50e0c00b4835e8f2fedb1d7c1f89f' 
  AND token = 'inrvp/jxmqhptFWPkRQQTI/+DOUZCB2lwQUawHOwna8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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