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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26766c25f84863b387c1e215c2fbc7ce1e0c89258d621c802ea6f51ac6cc7397' 
  AND token = 'uAaaFOiF2O//oixPYycSbLU8CEg5t7Fb9DbmFJYKvq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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