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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793817816d641eaa912e7446842917c7bbe521de096e671e1f48aa98b4f69731' 
  AND token = 'tejE7tvk7sT9/5SoYLDzd4fJnT/N6cCoUUGuVxLyxrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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