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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60df8a31ba209f1e4876fe70886b0bdc96b74f3f4f72cb0fd88b420ab988d39' 
  AND token = 'imCXoZO7ZEXQLfltVnNoi1K5YtmMVuwyCgMgQ5TSJ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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