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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8d02cd402d5552a8ef3e0cafd0ff32af0b38fa9608cd8b918de315067b65cf' 
  AND token = 'F0CS8Ao7mkFGKmq4eC059/z2Yts+hzToVot74MAyF3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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