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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9621238d30de6b236866565e7ebb8dcba5fe743867e4208c968512015c0cddc7' 
  AND token = 'LXD3pJlDnizPtyQi4viIzlz177zIoXjhmrKtoAI8JAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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