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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b261a670919e4a2c7638216e8b9d9ef94683b7cce5747ca9b0c3d694140de24' 
  AND token = 'b0pfV0reINcQxq+yGYl1ouzEIskH8fkjWpD8HsYfrBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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