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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0828cab734650117a4108ea94da7befb184fc621659d5299a0f369578e7d27' 
  AND token = 'rmX6hBdePfmUgMiUxxdBjBEN4gn2asRKwFCPCMuzKdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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