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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ff0bb09e802a35b0829ef0b356fe6bd352be1891d5dbd9b55f4ac13b0aaf34' 
  AND token = 'al87261GK3scM7v3XiSYNu0jA/fIcpb30fa7LFtAPuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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