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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072094fb4f3a0a057ff3c60b1198051985cb5e689cfb82b8390e7eec553bd888' 
  AND token = 'Dn+uPhcIOcLsOg+DaBXyCTa7kjlIns506GDB/NYsuP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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