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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685c582dbf313e8842e585ec54ffe604b11467fe6788e1f64e91dc0008cff0e8' 
  AND token = 'IjeenWYTSLZeXnhsDRJU5nYsNwydwOB0hFcsqqTiwcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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