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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d02873349f77afc2d43cda4e71939923d7de8c9393cbf4b3b8de74a2e2bfb28' 
  AND token = '/gMU+os16Wop9zrwtsySUf2loRC29bMufDbgO/FurQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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