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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe77674b7525ce91b75c62ded716ef9ddb83913f5fb029b057c8ef0abe2e475' 
  AND token = 'VlofR+lCCVG53yJu6ZWI9JIloBgmhZhpeg1Mv3UdJSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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