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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da69b1d554a1e2df2f98649708ef6e681ed2b37ea94aca2764482a7a85371c79' 
  AND token = 'xF/zY8ELNIL4FPQUPXfwHISjwIN0LZ2PObHS3GxWzDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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