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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2ee6dc5ab6d3279b272980d37f6a6bfec525d50e5ab38428ac9bbdd4d29665' 
  AND token = 'OL6jN9HOmLxHPWG5/YKTZmHb1flvzme55A3guoehtm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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