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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb3383aed221106861e7d47f769c7085108f4d95342617e4fd10cf7cd59bad8' 
  AND token = 'pu7ptk2o5deURHALUAb0UmkHkx1wIevpnyqCUVsHvDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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