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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abc35ff9e241a7becaeb90a68f8e96efb39ceb8148dd3ba415af5aa235ca5a8' 
  AND token = '+VuN+CE/F8C44FIhLHldZ8I7vmBG1P0KNxMMe2BobC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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