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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9630e192fdf070bc95afd1ac204f7a93b71ebc5c71fcf22861dac69913881c61' 
  AND token = '6uDdOnc1J3mg0ULt1QnjJ5Jr0eE3/szCLchtjW9lRIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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