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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1917d50a6bb34bf0a4d28efe13a6297643ace690d643da378cdd804064e636' 
  AND token = 'lBSM52B2FyC4HSBQ9KQXmEZnJeroCMvWHOYO7P9O9GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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