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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03fa84ec25d853aed05f0d6e93ea4be8b88b1d56f41e13573aefdf02712c437' 
  AND token = 'yl6hpO8yDfV1aVAt9cmKuZn1hpmMVJapJzfH5DTgF5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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