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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9766ed8cad0fa7b8f902752e4e2ae90a2eb8fdc7372b28d0b1dad7e281430288' 
  AND token = 'Bd0OMMkUmoHQR7Rr4SFCYlAc3o15faDNLUMnLhaWPew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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