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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9124f9c8fdc299c0300ea1edcd00c777f2710b7eecc4d176784f7be90d64234c' 
  AND token = 'XsVYm+IwPGD64mfAdTmdjM88l7d19hIm9JIqDhPxd+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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