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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9167855f8e45f613c3d1600ef0a746f4f83b889d040eeac487e0797698ca04fa' 
  AND token = 'vgRjiEmctvonyXN7ZLdqtP9TIGhsuoD9GY5XQGU3nqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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