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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aefc7aa34c000b70c6758bb461e5096006d71423f1c30eb12aa659cd888fc6c' 
  AND token = 'tcqAeERgq9xHwAQoDmRwua2OpwnkKRTDkhNrdamOtSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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