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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0011592f72f9f94920d555f169c58a107dfc52120b2d5185f182be63b41880da' 
  AND token = 'AzYN3lO1tgixL/NHU2MeMHfF68XTcyfHwfXtmG9mxTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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