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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52556af939ba0c05b21ee60b5c700ea5d98206bc540a3fc60fdbc353b7b0002b' 
  AND token = 'YT4U+d4yYks5/ZIv8OXnH6jqOiI57+EgYWGhR7aEoCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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