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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2947398127c5be8a20251ab03e0586b891ffeb7c35f7298865563daed0bb97' 
  AND token = 'amfAOJkBTFZtY+o9RmlTOqXgqFLX5nqPFAqC7f6h95c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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